Trisubstituted barbituric acids and process of making them.



BEST AVAlLABLE C Patented February 14, 1905.

diaries idATENT OFFICE.

lillll. l lSQlllih. OF lilil-ililb (*llili.\,l.-XNY, ASSIGNOR TO THE FIRM (ll l). UlCRtlC, Oi llMllMSilAllYll, GERMANY, A COPAR'lNEltSl-lll.

TPdSUBSTlTUTED BARBlTURIC ACIDS AND PROCESS OF MAKING THEM.

SPECIFICATION forming part of Letters Patent No. 782,742, dated February 14, 1905.

Original application filed January 22, 1903, Serial No. 140,108. Divided and this application filed August 16,1904. Serial No. 220.969.

(Specimens) Be it known that l. .llllILlfiSClU-lli, a subject of the .lhnperor of Germany, and a resident of Bel-limbermany,have invented certain new and useful lmprovements in 'elrisubstituted liarbituric Acids and Processes of Making in which and 3/ represent any radical, such as i'nethyl, for which may be substituted any homologous and analogous radicals described in Examples 8 and l) of the said application. \ccordin; to my researcl'ies these compounds are obtained by condensing disubstituted mataining as substituting groups methyl, for which may be substituted any homologous in a closed vessel. During the operation the sodium salt of the new barbituric acid derivative is 'n'ecipitated. On cooling it is filtered off, decomposed with hydrochloric acid, and the precipitated diethyl-N-methyl-barbituric acid is recrystallized from hot water. This compound crystallizes in colorless needles, melting at 154:.5 Centigrade and has the composition CUHHNBQL .ljimmp/e .Q])Zct/r;1 Z fl p/wily] Zia/Mirna? (mi/1: 6.41 parts of sodium are dissolved in as little alcohol as possible, twenty parts of diethyl-malonic ester and 16.7 parts of pow dered phenyl-urea are added, and the mixture is heated to 105 to 108 centigrade for four hours, wherein but a little sodium carbonate precipitates. Then the mixture is acidulated with hydrochloric acid and the alcohol is ;e\ 'aporated. Thehereby-precipitateddiethyl- N-phenyl-barbituric acid is washed with cold lomc esters with nioiniisubstituted urea coni and analogous radical in the presence of soi dium alcoholate. in this manner trisubsti tuted barbituric acids are obtained which form colorless crystals dillicultly soluble in water, soluble in sodium hydroxid and potassium hydroxid, thus forming salts by the rel placement of the hydrogen of the NH group I by metal. These products possesstherapeutic value as lrvpnotics. the average dose being 0.5 to one gram.

in naming the products described herein 1 deal of hot water.

acid is 197 centigrade.

water and then recrystallized from a great The melting-point of this It has the composition CuiImOaNa and dissolves slightly in hot alcohol and in alkali solutions.

Although I have above described examples by which the trisubstituted barbituric acids may be obtained, nevertheless ldo not wish to be understood as thereby excluding equivalents for the ingredients, theai'i us, or the operations employed in the p able that substitutes may b0 h b' add the letter to that radical which replaces V 56% h -t f formmg salts with man the ll of the Nll group, it appears in my scientific publications on this subject.

in carrying out my process practically l can proceed as follows:

' out departing fror the one of the invention intended to be secured hereby.

The new trisubstituted barbituric acids posmetalsfor example, the alkali metals. the

. the metal.

Having now described my invention and in what manner the same is to he performed, what I claim as new, and desire to secure by Letters Patent, is

1. The herein-described new process of malting trisubstitut-ed barbituric acids, having the general formulaing diethyl-N-methyl barbituric acid, consisting in condensing diethyl malonic-acid ester and methyl urea in thepresence of metal alcoholate, separating the thus-formed sodiumsaltof the dicthyl-N-methyl barbituric acid by liltration and precipitating the free diethyl- N-methyl barbituric acid by means of acid.

BEST AVAlLABLE CG.

3. Theherein-described new products being trisubstituted barbituric acids, having the following general formula in which fl and y represent any radicals, such as methyl for which may be substituted any homologous and analogous group, characterized by forminglarge crystals, diflicultly solu ble in hot water and soluble in solutions ol alkali and in the salt form of which the hydro gen of the NH group is replaced by alkali metal.

L. The herein-described new diethyl-N-methyl barbituric acid, which in the acid form melts at 1.54:.5 centigrade when recrystallized from hot water and is soluble in solutions of sodium hydrate and potassium hydrate and in the salt form of which the metal replaces the hydrogen of the NH group.

in testimony whereof I have signed my name in the presence of two subscribing witnesses.

Eh'IlL l llSCl'llCR.

'itnesses:

E. ALDERHALDEN, F. RnU'rnR. 

